sys/kern/subr_power.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2001 Mitsuru IWASAKI
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/eventhandler.h>
  31 #include <sys/power.h>
  32 #include <sys/proc.h>
  33 #include <sys/systm.h>
  34 #include <sys/taskqueue.h>
  35
  36 static u_int             power_pm_type  = POWER_PM_TYPE_NONE;
  37 static power_pm_fn_t     power_pm_fn    = NULL;
  38 static void             *power_pm_arg   = NULL;
  39 static struct task       power_pm_task;
  40
  41 static void
  42 power_pm_deferred_fn(void *arg, int pending)
  43 {
  44         int state = (intptr_t)arg;
  45
  46         power_pm_fn(POWER_CMD_SUSPEND, power_pm_arg, state);
  47 }
  48
  49 int
  50 power_pm_register(u_int pm_type, power_pm_fn_t pm_fn, void *pm_arg)
  51 {
  52         int     error;
  53
  54         if (power_pm_type == POWER_PM_TYPE_NONE ||
  55             power_pm_type == pm_type) {
  56                 power_pm_type   = pm_type;
  57                 power_pm_fn     = pm_fn;
  58                 power_pm_arg    = pm_arg;
  59                 error = 0;
  60                 TASK_INIT(&power_pm_task, 0, power_pm_deferred_fn, NULL);
  61         } else {
  62                 error = ENXIO;
  63         }
  64
  65         return (error);
  66 }
  67
  68 u_int
  69 power_pm_get_type(void)
  70 {
  71
  72         return (power_pm_type);
  73 }
  74
  75 void
  76 power_pm_suspend(int state)
  77 {
  78         if (power_pm_fn == NULL)
  79                 return;
  80
  81         if (state != POWER_SLEEP_STATE_STANDBY &&
  82             state != POWER_SLEEP_STATE_SUSPEND &&
  83             state != POWER_SLEEP_STATE_HIBERNATE)
  84                 return;
  85         power_pm_task.ta_context = (void *)(intptr_t)state;
  86         taskqueue_enqueue(taskqueue_thread, &power_pm_task);
  87 }
  88
  89 /*
  90  * Power profile.
  91  */
  92
  93 static int      power_profile_state = POWER_PROFILE_PERFORMANCE;
  94
  95 int
  96 power_profile_get_state(void)
  97 {
  98         return (power_profile_state);
  99 }
 100
 101 void
 102 power_profile_set_state(int state)
 103 {
 104         int             changed;
 105
 106         if (state != power_profile_state) {
 107                 power_profile_state = state;
 108                 changed = 1;
 109                 if (bootverbose) {
 110                         printf("system power profile changed to '%s'\n",
 111                                 (state == POWER_PROFILE_PERFORMANCE) ?
 112                                 "performance" : "economy");
 113                 }
 114         } else {
 115                 changed = 0;
 116         }
 117
 118         if (changed)
 119                 EVENTHANDLER_INVOKE(power_profile_change, 0);
 120 }